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Narrow Band Tunable Infrared Laser at 823 cm/-1/ (12.1 Micron)

IP.com Disclosure Number: IPCOM000089416D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Grischkowsky, DR: AUTHOR

Abstract

823 cm/-1/ radiation is generated for laser isotope separation by pumping a cesium (Cs) vapor heat pipe discharge tube with a pulsed dye laser tuned to 8761.4 Angstroms.

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Narrow Band Tunable Infrared Laser at 823 cm/-1/ (12.1 Micron)

823 cm/-1/ radiation is generated for laser isotope separation by pumping a cesium (Cs) vapor heat pipe discharge tube with a pulsed dye laser tuned to 8761.4 Angstroms.

Fig. 1, the energy level diagram for Cs, shows that the energy separation between 6D(3/2) level and the 7P(1/2) level is 823.24 cm/-1/, which compares very well with one of the few frequencies needed for laser isotope separation, namely 823 cm/-1/ +/- 1 cm/-1/. Since the oscillator strength of this transition is larger than for any other transition from the 6D(3/2) level, lasing will only occur at the desired 823 cm/-1/ frequency if the 6D(3/2) level is selectively populated to a sufficient degree. This is accomplished by pumping atoms from the 6P(1/2) level to the 6D(3/2) level with a tuned pulsed dye laser. For cesium vapor pressure on the order of 1 torr, excitation in the 6P(1/2) level is severely radiatively trapped, the effective lifetime of the 6P(1/2) level being thus lengthened from 35 nsec to hundreds of microseconds, consequently facilitating pumping of the 6P(1/2) level. Furthermore, atoms very rapidly cascade down from the 7P(1/2) level back to the 6P(1/2) level, allowing the same atom to be again excited to the 6D(3/2) level.

Passing a current of 40 mA through a 100 cm long cesium vapor heat pipe discharge tube containing several torr of Cs vapor will excite a sufficient number of atoms to the 6P(1/2) state. A 50 kw dye...